External Purchase Report 401 error

Features being implemented store External Payment Report

Implementation Language and Framework JAVA springboot

a problem https://developer.apple.com/documentation/externalpurchaseserverapi/send-external-purchase-report?changes=latest_major

I send jwt tokens in the header to the apple endpoint If a 401 authentication error occurs all of a sudden while being sent successfully in the beginning, a 401 error has occurred since then

What I checked

• Tokens are being re-created and sent every time a report is sent
• I'm currently using aws ec2 load balancer and I get 401 error and when I shut down Tomcat and restart it, it works normally and then the above problem occurs again
• Even if I send the token that I used to send since 401 happened using postman, 401 error
• If my local server issues tokens again with the same content and sends the report to postman, it works fine

Considering the above problems and the confirmed contents, why 401 problems suddenly occur I'd like to know how to solve that part.

private String keyId="******";
private String issuerId="******";
private String bundleId = "ai.******";

Instant now = Instant.now();
Date issuedAt = Date.from(now);
Date expiresAt = Date.from(now.plusSeconds(20 * 60));
public String createToken(){
    try {
        PrivateKey key = getPrivateKey();

        return Jwts.builder()
                .setHeaderParam("alg", "ES256")
                .setHeaderParam("kid", keyId)
                .setHeaderParam("typ", "JWT")
                .setIssuer(issuerId)
                .setIssuedAt(issuedAt)
                .setExpiration(expiresAt)
                .setAudience("appstoreconnect-v1")
                .signWith(key, SignatureAlgorithm.ES256)
                .claim("bid",bundleId)
                .compact();
    }catch (Exception e){
        e.printStackTrace();
        throw new RuntimeException("JWT error", e);
    }
}

private static PrivateKey getPrivateKey() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
    InputStream privateKey = new ClassPathResource("certs/SubscriptionKey_***********.p8").getInputStream();

    String result = new BufferedReader(new InputStreamReader(privateKey)) .lines().collect(Collectors.joining("\n"));

    String key = result.replace("-----BEGIN PRIVATE KEY-----\n", "")
            .replace("-----END PRIVATE KEY-----", "")
            .replace("\n", ""); 
    byte[] decoded = Base64.getDecoder().decode(key); 
    PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(decoded);
    KeyFactory keyFactory = KeyFactory.getInstance("EC");
    return keyFactory.generatePrivate(keySpec);
}